了解泛型、反射、单例模式的请进。

package net.javayuan.util;



import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;



/**

 * @(#)VO2PO.java Jan 23, 2008 9:00:55 AM

 * 

 * @author Yuan

 * VO到PO的属性复制工具

 */

public class VO2PO {

    

    private static final VO2PO INSTANCE = new VO2PO();

    

    private VO2PO(){

        //

    }

    

    public static VO2PO getInstance(){

        return INSTANCE;

    }

    

    /**

     * 复制属性

     * @param vo 源对象

     * @param po 目标对象

     * */

    public void copyProperties(Object vo, Object po){

        

        Class<?> voClass = vo.getClass();

        Class<?> poClass = po.getClass();

        

        Method[] methods = voClass.getDeclaredMethods();

        

        for (Method method : methods){

            String methodName = method.getName();

            String fieldName = "";

            String setterName = "";

            

            if (methodName.startsWith("get")){

                fieldName = methodName.substring(3,4).toLowerCase() + methodName.substring(4);

                setterName = "set" + methodName.substring(3);

            }

            

            if (methodName.startsWith("is")){

                fieldName = methodName.substring(2,3).toLowerCase() + methodName.substring(3);

                setterName = "set" + methodName.substring(2);

            }

            

            if (!"".equals(fieldName)){

                try {

                    Object o = method.invoke(vo, new Object[]{});

                    if (o != null){

                        Class<?> fieldType = poClass.getDeclaredField(fieldName).getType();

                        Method setter = poClass.getDeclaredMethod(setterName, fieldType);

                        setter.invoke(po, o);

                    }

                } catch (IllegalArgumentException ex) {

                    ex.printStackTrace();

                } catch (SecurityException ex) {

                    ex.printStackTrace();

                } catch (IllegalAccessException ex) {

                    ex.printStackTrace();

                } catch (InvocationTargetException ex) {

                    ex.printStackTrace();

                } catch (NoSuchMethodException ex) {

                    ex.printStackTrace();

                } catch (NoSuchFieldException ex) {

                    ex.printStackTrace();

                }

            }

        }

    }

    public static void main(String[] args){

        Bean bean1 = new Bean();

        bean1.setBooleanValue(true);

        bean1.setStringValue(null);

        bean1.setIntValue(321);

        

        Bean bean2 = new Bean();

        bean2.setBooleanValue(false);

        bean2.setStringValue("bean2");

        bean2.setIntValue(123);

        

        VO2PO.getInstance().copyProperties(bean1, bean2);

        

        System.out.println(bean2.getIntValue());

        System.out.println(bean2.getStringValue());

        System.out.println(bean2.isBooleanValue());

    }

}



class Bean{

    

    private int intValue;

    private String stringValue;

    private boolean booleanValue;

    

    public int getIntValue() {

        return intValue;

    }

    

    public void setIntValue(int intValue) {

        this.intValue = intValue;

    }

    

    public String getStringValue() {

        return stringValue;

    }

    

    public void setStringValue(String stringValue) {

        this.stringValue = stringValue;

    }

    

    public boolean isBooleanValue() {

        return booleanValue;

    }

    

    public void setBooleanValue(boolean booleanValue) {

        this.booleanValue = booleanValue;

    }

}